Now that I own the 5.4 liter, FLEX FUEL VEHICLE, F-150 4x4, I am realizing a very poor "gasoline" fuel economy of about 10 MPG highway which is much less than the 18 MPG that was posted on the window sticker. E85 is much worse. The non-adjustable seat bottom revealed itself as a rear end problem after the first 200 miles. I am not sure what the engineers at Ford were thinking when an adjustable seat bottom was not added to the lower lines of pickups. I would have been happy with even a manual adjustment. I don't think that these problems are going to disappear as my wallet gets much thinner.
I have a 2007 ford f150 Stx 4.6L. At idle it shakes so bad I had to put a pillow behind my back. Several times it even stalled. Ford said all these trucks do this. It is a natural characteristic of the truck to run rough. I say it is time to recall and fix the design flaw these trucks have.
Bought the vehicle on 22 May 07 with 81 miles on the odometer. Left for Wash D.C. on the 26th to attend the event at 'Rolling Thunder" memorial. Disappointed with the fuel economy and the black soot at the exhaust pipe. Vehicle drives well but is underpowered on some of the taller hills on Interstate 40. Thinking the pickup is too heavy for a V6 engine.